Closing Bell Overtime: A Wild Day of AI Developments 9/29/26

OpenAI’s Sam Altman and Sarah Friar are back in focus as the debate over the pace of AI development intensifies and we here directly from them at the company’s DevDay. President Trump convened an AI summit of heavy hitters at the White House. Tusk Ventures’ Bradley Tusk weighs in on if they agreed to anything worthwhile. RBC Capital Markets’ Lori Calvasina breaks down growing consumer concerns and what they could mean for the market. BetMGM CEO Adam Greenblatt discusses why the company is staying out of prediction markets as competition across betting heats up.